TY  - RPRT
TI  - Introduction
AU  - A.R. Drysdall
AU  - C.R. Ramsay
AU  - D. B. Stoeser
PY  - 1986
DO  - 10.1016/s0899-5362(86)80064-1
UR  - https://pubs.usgs.gov/publication/70030581
ID  - 70030581
ER  -